Rotary compressor



Patented Fee. 1, 1931 STAT E UNETE R'QTARYH C I Application filed December especially adapted for direct connect-ion to electric' motors to operate efficiently "at the high speeds required by such connections. In order to accomplish efficient operation of the compressor, I have provided a form wherein the cylinder and piston rotate as a unit with the end seals so that the relative movement and consequently the wear in the pump is reduced to a minimum, thus resulting in long life. An advantage of my arrangement over the usual form of vane pilmp is that vane friction is eliminated, the full and uninterrupted bearing of the rotating cylinder being far less subject to wear.

It is also an object of this invention to provide a rotary compressor embodying improved self-adjusting end seals for the compression space.

It is another object of this invention to provide an improved and simplified rotary -compressor that can be varied in capacity at slight cost by simply varying the diameter of the rotor and'the eccentricity of the rotor shaft in the casing. To this end the bear ings for the rotor' shaft are formed as removable eccentric sleeves which may be replaced by externally similar sleeves having adifierent eccentricity in order that a'variety of sizes of casings, etc. may be replaced by a single standard casing.

Other and further important objects of this invention will be apparent from the disclosures in the specification-and the accompanying drawings.

This invention (in a preferred form) is illustrated in the drawings and hereinafter more fully described. I

, On the drawings: Figure 1 is a horizontal section through a compressor embodying the features of this invention, this section being an enlarged representation on the line II of Figure 2.

Figure 2 is a vertical cross section of the compressor taken on the line 11-11 of Fig:

ure 1 on a reduced scale.

omranssoa 1a, 1927. Serial a. 246,986.

As shown on the/drawings A cylindrical casing 10 is provided with cooling fins 11 and suitable mo-untingfeet 12, the casing having a simple cylindrical bore 13 with ofiset oppositely disposed inlet and outlet connections 14: and 15 in the wall thereof. Each end of the bore is closed by substantially similar end covers16 bolted to the casing and having centrally apertured boxes 17 thereon aligned with the axis of the cylindrical bore 13. Cylindrical sleeve bearing shells 18 and 19 are mounted in the bosses 17 the sleeve 18 being an end hearing, so that the boss 17 therefor is sealed by a plug 20, while the sleeve 19 is extended beyond the end of the other cover boss and is formed to receive packing 21 and a packing nut 22.

The sleeve bearing shells 18 and 19 are intended to be readily replaceable and are formed with eccentric shaft apertures 23 for a shaft 24, it being an object of this invention to provide a series of such sleeve bearing shells with varying eccentricity of the shaft bearings to vary the displacement volume of the compressor.

The shaft carries a concentric rotor 25 secured thereon, this rotor being relieved at the sides adjacent the sleeves to reduce frie tion and permit limited side play. The cylinder of the compressor proper is formed as a shell 26 having a counterclockwise rotation in .the casing bore 13, and a groove 27 is formed thereon over part of the outer surface in alignment with the outlet connection 15. This groove communicates with the interior' of the shell through an outlet port 28 and a similar port 29 and groove-29a ofiset from the port 28 and its groove 27 forms the suction or inlet connection from the suction space between the rotor 25 and the shell 26. The shell is purposely made wider than the rotor to provide for end sealing discs 30 having peripheral flanges 31-bearing against the inside of the shell 26. These discs also have flanges 32 journalled on inward extensions 33 on the sleeve bearing shells 18 and 19 which are concentric with the cylinder. The cylinder is yieldingly maintained in alignment with the rotor and the end seals are simultaneously urged against the rotor by means of lu s at and springs beneath the heads of bolts 36 passing through clearance apertures 37 in the rotor.

Elie cylinder 26 is rotated by the rotor 25 by means of a partition blade 38 which has a rocker-like bearing 39 in the inner surface .of the cylinder and slides between semi-circular bearings 40 in the rotor.

It will be evident from the foregoing description that by increasing the eccentricity of the shaft bearings in the sleeves 18 and 19 and simultaneously decreasing the diameter of the rotor, the capacity of the compression space will be increased and vice versa. Thus,

the same casing, cylinder, end seals and shaft,

space to the left of the vane is decreasing in area at the, same time asit shifts around towards the point of tangency adjacent the lead line 24. When the vane location passes the point of tangency a new cycle is started, fluid being drawn in back of the vane through the I port.29, while a previous charge is being compressed ahead of the vane. The fluid drawn in back of the blade is transferred to the' front thereof by the movement of the vane past the point of tangency of the eccentric cylinder and rotor. The spring urged end plates 30 serve to take up wear and also act as relief valves should excessive pressures develop due to the admission of slugs of liquid.v

I am aware that many changes may be made, and numerous details of construction may be varied through a wide range without departing from the principles of this invention, and I therefore do not purpose limiting the patent granted hereon, otherwise than necessitated by the prior art.

I claim as my invention:

1. A rotary compressor comprising a cas-v ing, a cylindrical shell rotatable therein, end closures for said casing, a shaft eccentrically journalled in said end closures, a rotor on said shaft within said shell, a partition blade connecting said shell to said rotor and end seals yieldingly and slidingly attached to said rotor and contacting said shell.

2. A rotary compressor'comprising a casing, a cylindrical shell rotatable therein, end closures for said casing, a shaft eccentrically journalled in said end closures, a rotor on essence said shaft within said shell, a partition blade connecting said shell to said rotor, and end seals on either end of the rotor having a hearing inside said shell.

8. A rotary compressor comprising a cylinder, a shaft eccentric thereto, a rotor on said shaft, a partition blade connecting said cylinder to said rotor, and end seals yieldingly and slidingly attached to said rotor and contacting said shell.

4:. A rotar compressor comprising a cylinder, a sha t eccentric thereto, a rotor on said shaft, a partition blade connecting said cylinder to said rotor, and end seals on either elrid1 lof the rotor having a bearing inside said s e 5. A rotary compressor comprising a casing, a cylindrical shell rotatable therein, end closures for said casing, a shaft eccentrically journalled in said end closures, a rotor on said shaft within said shell, a partition blade connecting said shell to said rotor, end seals associated with said rotor having a bearing inside said shell, and means yieldingly urging said seals against said rotor.

6. A rotary compressor comprising a cylinder, a shaft eccentric thereto, a rotor on said shaft, a partition blade connecting said cylinder to said rotor, end seals on either end of the rotor having a bearing inside said cylinder, and means yieldingly urging said seals against said rotor.

In testimony whereof I have hereunto sub scribed my name.

' JOHN T. TRUMBLE. 

